 //鼠标滚轮距离
 let html = document.documentElement || document.body;
 let aside = document.querySelector('.aside');
 let newNav = document.querySelector('.new-nav')
 window.onscroll = function () {
     if (html.scrollTop >= 400) {
         aside.style.opacity = 1;
         newNav.style.display = 'block';
         newNav.style.top = 0;
     }
     else {
         aside.style.opacity = 0;
         newNav.style.display = 'none';
     }
 }